Ernie Ball 2721 Cobalt Regular Slinky Electric Strings

.010-.046 Electric Guitar Strings - Cobalt
Ernie Ball 2721 Cobalt Regular Slinky Electric Strings image 1
Ernie Ball 2721 Cobalt Regular Slinky Electric Strings image 1
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Ernie Ball 2721 Cobalt Regular Slinky Electric Strings
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Next-gen Guitar Strings

Ernie Ball Cobalt guitar strings are made of a new alloy formulation that gives you higher output, better sound, and longer life. Cobalt strings' special iron/cobalt blend attracts the magnets in your pickups better than any other alloy. When you string up with Ernie Ball Cobalts, you'll immediately notice the incredible comfort these strings offer - silky and pliable under your fretting fingers; your pick will seem to glide over the strings, letting you execute fast passages effortlessly. And when you plug in, you'll get increased power, beefy yet defined lows, improved midrange focus, harmonics, and sustain, and crisp highs. Try a set of Ernie Ball Cobalt strings - you're gonna love 'em!

Ernie Ball Cobalt Guitar Strings at a Glance:
  • Beta tested by the creme de la creme
  • Cobalt formula gives you higher output and better sound
  • Cobalts last longer
Beta tested by the creme de la creme

In the development of their Cobalt strings, Ernie Ball tapped select members of their star-studded artist roster - including Steve Morse, John Petrucci, Randy Jackson, Tony Levin, and Slash - to be beta testers for the new formulation. John Petrucci reported that the Cobalts sound "amazing," with "increased power, incredible clarity, and incredible sonic balance." He noted that the Cobalts seem "softer" under your fretting fingers (the term he used was "buttery"). Slash noted that - before being plugged in - the Cobalts "have an entirely different feel than normal strings." He goes on to characterize this sensation as "bouncy and pliable," and "a lot of fun for bending." When amplified, Slash commented that the Cobalts were just as bright as titanium strings, but more "guttural," with more "growl to them."

Cobalt formula gives you higher output and better sound

A half century ago, Ernie Ball practically invented "rock" guitar strings. And now, with Cobalt, they've re-invented them. After exhaustive testing of over 350 alloy combinations, the company ended up with an optimal formula that - as compared with conventional strings - gives you higher output, beefier lows with increased definition, improved midrange focus, shimmering harmonics and more robust sustain. You get a brighter sound without inducing harshness by turning up the treble on your amp.

Cobalts last longer

Ernie Ball Cobalt guitar strings last longer, retaining their brightness long after other strings have given up the ghost. Steve Morse reported having a set on one of his guitars "for several weeks," and with daily use - "sweaty hands" and all - the Cobalts "still sound bright... They just don't have that dead sound," he says. So, with higher output, better sound, and the monetary benefits of not having to change strings so often, Cobalts have it all over traditional alloy formulations. Check out a set of Ernie Ball Cobalt strings - you'll love 'em!

Ernie Ball Cobalt Guitar Strings Features:
  • Punchier, higher output strings
  • Beefier lows, with increased definition and growl
  • Increased midrange focus, harmonics, and sustain
  • Longer-lasting than conventional strings
  • .010, .013, .017, .026, .036, .046
  • Made in USA
Try the strings the pros ar raving about: Ernie Ball Cobalt guitar strings

Tech Specs

Guitar Type Electric
Number of Sets 1
Coated No
Gauges .010, .013, .017, .026, .036, .046
Core Material Steel
Winding Material Iron/cobalt alloy
Winding Type Round
Manufacturer Part Number P02721

Customer Reviews

Based on 20 reviews
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Put Some Grrr in your Guitar

I've been playing Regular Slinkies for a while now on all my electrics, but I just restrung two of them with Cobalt Slinkies. I was literally taken aback. It's like I'd turned up my amp or something. I never thought I'd get this kind of sustain out of a Telecaster…and the Les Paul…. Wow. I'm pretty sure I heard upper partials I didn't know existed coming out of an electric guitar. You might actually irritate your drummer, the way these things cut through the mix.
Music background: Years of classical way back when, now just a hobbyist

Good bye Elixir

I have played since 1974. I remember back in the 70's when strings broke for me on a regular basis. I read about these in a interview with The ball family in Guitar player and felt "why not?" .. I put them on my 2012 Les paul classic custom since I had some issues with elixirs ( was my favorites) staying in tune on it. it was also a instructional moment for my daughter showing her the right way to string em up. Once i was done and tuned up I proceeded to play the hell out of them doing all sorts of bends and such for about 30 mins. My daughter asked me what was wrong. I was blown away. Still in tune. I have never had strings hold tune like that being brand new. I swear never have I been so sold on something. That was 2 weeks ago and have only had to make a few adjustments. Outstanding !!!!!!
Music background: semi


iv been playing GHS strings for years ,and a friend told me to try these out.i cant believe how good they are! I play metal mostly with high gain amps and these strings really clean up your sound.arpeggios sound totally different you can hear every note better and they seem to be louder as well its pretty crazy iv never been so happy with a pair of strings before.

I was a GHS Boomer guy... until now...

Best tone out of a string I've had in a long time. They stretch out well and my guitar just seemed to have higher, clearer output. I didn't believe there could be that much of a difference between string brands, but this one blows away all the others by far!
Music background: Church Musician

Ernie Ball Slinky Cobalt (Hawaii)

I've tried many different strings and wasn't to much a gimmick biter.. Everyone claims to have the best strings and rightfully they should feel that way cause it's their own product.. I have two small string endorsements that I've had for awhile until I got signed by Ernie Ball-music man a month or so ago.. I've used their super slinky for years and lets face it "there's nothing better then a great set of fresh strings on your instruments"! Being that this is my comment and review on these Cobalts I want you to know in no way am I bring partial or bias but giving you a true fact! Ready? Here it comes.. "Ernie Ball Cobalt strings are the best strings I've ever used in my entire life"! I've been a solidified professional full-time musician for 17 years and counting and I'm on stage a minimum of twice a week to 6-7 days a week.. I've literally tried them all or atleast I feel I have.. These strings are a pleasure to use and feel so seductive and light but still holds beautiful tone,sustain is amazing and the output seems to have more gain in it.. Idk what else I could say but this " best strings on the market" hands down! Aloha
Music background: Artist,musician,producer,recording engineer and Ernie Ball- Music ManArtist
See also: Electric Strings, Ernie Ball, Ernie Ball Electric Guitar Strings